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Equity Accumulated Other Comprehensive Loss (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Jan. 01, 2018 | Dec. 31, 2017 | Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Retained Earnings (Accumulated Deficit) | $ (1,133,000,000) |  | $ (1,133,000,000) |  | $ (2,209,000,000) | $ (2,276,000,000) |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent |  |  | (163,000,000) |  |  |  |
Other Comprehensive Income (Loss), Net of Tax | (8,000,000) | $ 93,000,000 | (56,000,000) | $ 155,000,000 |  |  |
Unfunded pension obligation, Net of Tax | (52,000,000) |  | (52,000,000) |  |  | (57,000,000) |
Foreign currency translation adjustment, Net of Tax | (1,718,000,000) |  | (1,718,000,000) |  |  | (1,486,000,000) |
Accumulated Other Comprehensive Income (Loss), Net of Tax | (2,020,000,000) |  | (2,020,000,000) |  | (1,857,000,000) | (1,876,000,000) |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax |  |  | (222,000,000) |  |  |  |
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax | (250,000,000) |  | (250,000,000) |  |  | $ (333,000,000) |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  | 59,000,000 |  |  |  |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax | (45,000,000) | 80,000,000 | (160,000,000) | 127,000,000 |  |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax | 15,000,000 | 5,000,000 | 32,000,000 | (42,000,000) |  |  |
Total pension adjustments, net of income tax | 1,000,000 | $ 7,000,000 | 5,000,000 | $ 20,000,000 |  |  |
AOCI Attributable to Parent [Member] |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax |  |  | (232,000,000) |  |  |  |
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax |  |  | 9,000,000 |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  | 55,000,000 |  |  |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax |  |  | 64,000,000 |  |  |  |
Accumulated Defined Benefit Plans Adjustment [Member] |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax |  |  | 0 |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  | 5,000,000 |  |  |  |
Total pension adjustments, net of income tax |  |  | 5,000,000 |  |  |  |
Accumulated Translation Adjustment [Member] |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax |  |  | (231,000,000) |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  | (1,000,000) |  |  |  |
Alto Maipo [Member] |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax |  |  |  |  |  |  | $ (33,000,000)
ASC 606 Impact [Member] |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Retained Earnings (Accumulated Deficit) | 98,000,000 |  | 98,000,000 |  | 67,000,000 |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | $ 18,000,000 |  | 18,000,000 |  | $ 19,000,000 |  |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax |  |  | 19,000,000 |  |  |  |
ASC 606 Impact [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax |  |  | 19,000,000 |  |  |  |
ASC 606 Impact [Member] | Accumulated Translation Adjustment [Member] |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax |  |  | $ 0 |  |  |  |

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e681-108580 + Details
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